Align uffd compacted spaces for faster mremap during pause am: 5cac217cdc am: 24134b6212 am: 5ce55f51b3

Original change: https://android-review.googlesource.com/c/platform/art/+/2327413

Change-Id: I39686843f5317fd8f566f68b9aa89e9a8254b8b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>